<template>
    <div class="login_container">
         <!-- 头像区域 -->
        <div class="login_box">
            <div class="logo"></div>
             <!-- 登录表单区域 -->
        <el-form ref="loginFormRef" :rules="loginFormRules" :model="loginForm" label-width="0px" class="login_form">
            <!-- 用户名 -->
     <el-form-item label="" prop="username">
    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user" ></el-input>
  </el-form-item>
  <!-- 密码 -->
     <el-form-item prop="password" >
    <el-input type="password" v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"></el-input>
  </el-form-item>
  <!-- 按钮 -->
   <el-form-item class="btns">
    <el-button type="primary" @click="login">登录</el-button>
    <el-button type="info" @click="resetLoginForm('ruleForm')">重置</el-button>
  </el-form-item>

  </el-form >

        </div>

    </div>
</template>
<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //   验证规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 2, max: 5, message: '长度为2~5个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度为6~15个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    // 点击登录按钮
    login () {
      // 预验证
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 1、将登录成功后的服务器发送的token保存到客户端的sessionstorage（关闭浏览器清除）中
        // 1.1、项目中除了登录之外的其他api接口，必须登录后才能访问
        // 1.2、token只能在当前网站打开期间生效，所以要放在seeeionstorage中
        // console.log(res.data.token);
        window.sessionStorage.setItem('token', res.data.token)
        // 2、通过编程式导航跳转到后台主页，路由地址是/home
        // 2.1路由导航守卫控制访问权限
        this.$router.push('/home')
      })
    }
  }

}
</script>
<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height:100%;
}
.login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 5px;
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    .logo{
        position: absolute;
        width: 120px;
        height: 120px;
        border: 1px solid #eee;
        box-shadow: 0 0 20px #ddd;
        border-radius: 50%;
        background:url(../assets/logo.png) no-repeat #eee;
        background-size: contain;
        left:50%;
        transform:translate(-50%, -50%);
    }
}
.btns{
    display:flex;
    justify-content:flex-end;
}
.login_form{
    position: absolute;
    bottom:0;
    width: 100%;
    padding: 0 30px;
    box-sizing: border-box;
}
</style>
